TERREBONNE
SubstationLouisiana · ENTERGY LOUISIANA INC
At a glance
TERREBONNE is an electric transmission substation in Louisiana, on ENTERGY LOUISIANA INC's transmission network. It is classified as high-voltage (230 kv) and connects 4 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #112906 | 230 kV | ENTERGY LOUISIANA INC | IN SERVICE | 10.2 mi |
| #130554 | 230 kV | ENTERGY LOUISIANA INC | IN SERVICE | 0.8 mi |
| #149188 | 230 kV | ENTERGY LOUISIANA INC | IN SERVICE | 5.0 mi |
| #177737 | — | ENTERGY LOUISIANA LLC | — | 5.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TERREBONNE, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| WATERFORD 500KV | Substation-Adjacent | LA | St. Charles Parish | 500 kV | 1,000 MW | 4.3 yrs | 65.0 |
| UNKNOWN112611 | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 64.2 |
| LITTLE GYPSY STATION | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 62.7 |
| NORCO | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 61.1 |
| UNKNOWN112202 | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 61.0 |
| CLAYTONIA | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 61.0 |
| TAP143380 | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 60.8 |
| UNKNOWN114133 | Substation-Adjacent | LA | St. Charles Parish | 230 kV | 300 MW | 4.3 yrs | 60.8 |
How does TERREBONNE compare with other substations in Louisiana?
Louisiana has 1,305 substation records in HIFLD, of which 297 carry a station name; the rest are unnamed tap points, risers and line ends. 88 named substations in the state are in TERREBONNE's 230–344 kV band (30% of named stations). 17 sit in a higher band. 17 named substations in Louisiana operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 138 kV.
Who owns the transmission lines at TERREBONNE?
The 4 connected lines listed above are owned by ENTERGY LOUISIANA INC, ENTERGY LOUISIANA LLC. Line voltages range from 230 kV to 230 kV. Their combined recorded length is about 21 miles.
How do candidate sites near TERREBONNE score?
The 8 highest-scoring candidate sites within about 25 miles range from 61 to 65 on the 0–100 DC Readiness scale. They fall in St. Charles Parish. The Louisiana average across 1,762 scored sites is 53.1. 615 of those Louisiana sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TERREBONNE substation?
TERREBONNE has a maximum voltage of 230 kV. That places it in the 230–344 kV band. The median named US substation in this dataset is 115 kV, so TERREBONNE is above the national midpoint.
How many transmission lines connect to TERREBONNE substation?
4 transmission lines terminate at or pass through TERREBONNE in the HIFLD line data. The connected lines listed here run at 230 kV. Together the listed lines cover about 21 miles.
Who owns TERREBONNE substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TERREBONNE belong to ENTERGY LOUISIANA INC, and others to ENTERGY LOUISIANA LLC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TERREBONNE substation located?
TERREBONNE is in Louisiana at 29.6589, -90.7562. The datacenter candidate sites closest to it are in St. Charles Parish.
Are there datacenter candidate sites near TERREBONNE substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TERREBONNE. The highest-scoring is WATERFORD 500KV at 65/100. Across Louisiana, the average DC Readiness score is 53.1.
Other 230 kV substations in Louisiana
- WATERFORD 230KV· 17 lines
- CARLYSS· 15 lines
- NINEMILE POINT· 14 lines
- WILLOW GLEN (230KV)· 14 lines
- WILLOW GLEN (500KV)· 14 lines
- LITTLE GYPSY STATION· 12 lines
- ADDIS· 10 lines
- HARELSON· 9 lines
- All named substations in Louisiana· 297 stations
- Datacenter candidate sites in Louisiana· 1,762 sites
- Brownfield and retired plant sites in Louisiana
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “TERREBONNE substation, Louisiana”, https://gridcensus.com/substations/louisiana/terrebonne-2b30b2e8 (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
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Every site and score for TERREBONNE substation, Louisiana is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.